# Talk:Nonsymmetric gravitational theory

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It turns out that the dynamical friction of photons can be exactly described by equation ${\displaystyle H_{0}=c/R_{E}}$, where ${\displaystyle H_{0}}$ is Hubble constant, ${\displaystyle c}$ is speed of light, ${\displaystyle R_{E}}$ is the radius of curvature of space a.k.a. Einstein's radius of the universe. BTW, it is also the reason why all the attempts to explain Hubble redshift with Newtonian attractive forces through tired light effect failed. The Newtonian gravitational forces are the result of the time dilaton and not directly of the curvature of space. To make the curvature of space working in Newtonian approximation one has to apply the conservation of energy and only then the Newtonian approximation turns out to be sufficient to show the influence of the curvature of space on the redshift of photons. As we know the results are that in Einstein's universe there shows up the Hubble constant of order of 70km/s/Mpc, and so of order of Hubble constant of our universe, and with the same (apparent) "acceleration of expansion" (${\displaystyle dH/dt=-H_{0}^{2}/2}$).